Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35a84f41829ecef…

MALICIOUS

PDF

78.8 KB Created: 2021-03-15 05:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9815d6820ab5624ac2d6ff3391629bac SHA-1: 97c7b53f78768563b3cf65055fdcbd1644cd1331 SHA-256: c35a84f41829ecef9eb8e6d3eda249e5a709f4858ab68c79bb47eaabf7fe876b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=how+to+use+heat+mode+in+voltas+ac PDF link annotation
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/388155.pdfIn PDF document text
    • https://xepolilibud.weebly.com/uploads/1/3/4/5/134591261/nibewepukoned.pdfIn PDF document text
    • https://xonedanafesiliw.weebly.com/uploads/1/3/4/6/134633415/2092804.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/jubanexuvolob_xamutika_bepejam_bodiviguwimezid.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/1071081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_6017224035a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_5fe9932028b82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_600391102153b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0a84a8-a00c-4bfb-99f0-1224d176a9ed/gagad.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_60b293b3e6d741bd974f24e00f3ee711.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e17e3b2-215a-4200-a45f-f55e8a582c0d/davaka.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_ea68bf94b54645bfb836ac2ebadac971.pdf?index=trueIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_3e08ed97f3b446c0a311c0c3d7eac5b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbba970-f9f3-4564-997d-9a909528828d/19670640898.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_76198a75d94a40cb9fab68c1f7d19d10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d729191f-518f-459b-ab78-0d3528cd9c6a/ansys_ls-dyna_users_guide.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_2faf9bf30a9d49ff9995a2ad2d5e5ffa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee83c741-bd52-48a7-89ac-772b4f82f1bf/sikevixopibavikebipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0270006-0db5-490e-9568-03e882269fbb/why_is_my_summer_baby_monitor_saying_no_signal.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_b9b5ab5e8e1c4483bd3fe54b3560bf0f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 2996 bytes
SHA-256: 72379fc19be134a9e24459b9ab6717c15475437c08ce37c730ae5bfc6d441086
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 5196 bytes
SHA-256: 1ed572f91d450b228a4500d41cd87fd2130884ed118b142074200a68093a137e
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 11460 bytes
SHA-256: 8794d241136a13e61c5c8a32f790419fc6b63bf6534d496d609e88c85088f2c7